Post-cracking shear modulus of reinforced concrete membrane elements

Rahal, Khaldoun N.

doi:10.1016/j.engstruct.2009.09.008

Cited by 32 publications

(19 citation statements)

References 9 publications

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“…There are other available analytical models and experimental tests for determining the post-cracking shear stiffness of RC membranes. The G eff /G measured from those membrane tests can be as low as 0.1 to 0.05 of the gross value [11] which is not frequently observed for wall tests. This can be attributed to the aforementioned damage localisation issue.…”

Section: Shear Stiffnessmentioning

confidence: 99%

“…Most seismic codes focus on effective flexural stiffness, as is the case with the latest revision made in ACI318-11 [3] which suggests that shear stiffness remains as the gross value (cl.8.8.2) or a 0.5 reduction factor is applied to all gross sectional stiffnesses similar to Eurocode 8. A recent revision of this issue by ATC72 [9] has commented that the limited test data and the scattering in the measured cracked shear stiffness prevent a conclusive value to be drawn, despite the fact that shear stiffness degradation can be as low as 1/10 or 1/20 based on RC membrane tests [9][10][11]. This is especially the case when diagonal cracking occurs in heavily reinforced members.…”

Section: Introductionmentioning

confidence: 99%

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Shear and Flexural Stiffnesses of Reinforced Concrete Shear Walls Subjected to Cyclic Loading

Tang¹,

Su²

2014

TOBCTJ

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Seismic analyses of concrete structures under maximum-considered earthquakes require the use of reduced stiffness accounting for cracks and degraded materials. Structural walls, different to other flexural dominated components, are sensitive to both shear and flexural stiffness degradations. Adoption of the gross shear stiffness for walls in seismic analysis prevails particularly for the design codes in the US. Yet available experimental results indicate that this could overstate the shear stiffness by more than double, which would hamper the actual predictions of building periods and shear load distributions among columns and walls. In addition, the deformation capacity could be drastically understated if the stipulated constant ductility capacity is adopted. This paper reviews the available simplified shear and flexural models, which stem from classical mechanics, empirical formulations and/or parametric studies, suitable for structural walls at the state-of-the-art. Reviews on the recommended flexural and shear stiffnesses by prominent design codes such as ACI318-11, Eurocode 8 and CSA are included. A database comprised of walls subjected to reverse-cyclic loads is formed to evaluate the performance of each model. It is found that there exist classical models that could outweigh overconservative codified values with comparable simplicity for practical uses.

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Section: Shear Stiffnessmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shear and Flexural Stiffnesses of Reinforced Concrete Shear Walls Subjected to Cyclic Loading

Tang¹,

Su²

2014

TOBCTJ

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“…The deformation of an RC beam is mainly composed of two components: flexural and shear deformations. Although shear deformation cannot be ignored, particularly for cracked RC beams with low span-effective depth ratios (i.e., lower than 3.0) [1], the literature has described fewer models for predicting it compared with flexural deformation [2][3][4]. Therefore, considerable efforts have been made to predict the shear deformation of RC beams over the last several decades.…”

Section: Introductionmentioning

confidence: 99%

Multi-angle truss model for predicting the shear deformation of RC beams with low span-effective depth ratios

Wang

Dai

Zheng

2015

Engineering Structures

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“…The entire hysteretic loops of framed shear walls, including the backbone curves, the initial stiffness, the yield point, the peak strength, the descending branch, the failure characteristics, the pinching effect, the residual displacement and the energy dissipation are considered in the developed program [6]. On the other hand, the shear modulus (G) of reinforced concrete membrane elements subjected to monotonic in-plane shearing stresses typically calculated using the elastic theory was replaced by a simple empirical equation [7]. Rahal presented a simple empirical equation for the calculation of the post-cracking shear modulus, given in the form of the tangent slope of the shear stress-strain curve [7].…”

Section: Introductionmentioning

confidence: 99%

Modified Reinforced Concrete Plane Stress Element Formulation for the Nonlinear Response of Seismic Resisting Systems

Ghatass

Khalik

Sallam

2016

Port-Said Engineering Research Journal

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Design of economic seismic resisting structural systems with an acceptable safety margin requires continuous improvements for the available numerical models and analysis tools. In this work, an improved reinforced concrete membrane element based on the modified compression filed theory (MCFT) is presented. The developed element is implemented into a developed finite element program in order to study seismic response of different types of seismic resisting systems which are commonly used in the construction of concrete buildings in Egypt. Two types of floor systems, (beamed/beamless floors) and two types of seismic resisting systems, (frames/coupled frames with shear walls), are investigated. Reinforced concrete flexibility-based beam column and plane stress elements were used to model frames and shear walls, respectively. The static response of these systems subjected to triangular load pattern was investigated through nonlinear static analysis. It was concluded that, the predicted force reduction factor based on nonlinear static analysis of the examined systems is 50% to 75% less than those provided by Egyptian code; such variation could lead to uneconomic or inadequate design.

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Post-cracking shear modulus of reinforced concrete membrane elements

Cited by 32 publications

References 9 publications

Shear and Flexural Stiffnesses of Reinforced Concrete Shear Walls Subjected to Cyclic Loading

Shear and Flexural Stiffnesses of Reinforced Concrete Shear Walls Subjected to Cyclic Loading

Multi-angle truss model for predicting the shear deformation of RC beams with low span-effective depth ratios

Modified Reinforced Concrete Plane Stress Element Formulation for the Nonlinear Response of Seismic Resisting Systems

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